From the list of OS categories listed, please select 4 and find an example of an OS within that category. Describe the following three aspects for each of the 4 operating systems selected: the hardware on which each OS runs, the interface each OS uses, and the main tasks performed by the OS.

List of operating system categories: batch, single-user, multi-user, distributed, network, multiprocessor, real-time, time-sharing, embedded system.